Haha... this was posted at CDF, too. Here's what I had to say about it...

First, the 2-5 day shipping would suggest that it's not in stock. Second, in my experience, if there has been a serious pricing error (they are charing $20 for a 1-pack, and note that this is a *10*-pack), they will just cancel the order. This is no small item. A 10-pack will cost you over $100. Even if it was a 1-pack, the pricing error is big enough that they'll most likely cancel.